#include <iostream>
#include <cmath>

class Circle {
private:
    double radius;

public:
    void setRadius(double r) {
        radius = r;
    }

    double getRadius() const {
        return radius;
    }

    double calculateArea() const {
        return M_PI * radius * radius;
    }

    double calculateCircumference() const {
        return 2 * M_PI * radius;
    }
};

int main() {
    Circle circle;

    circle.setRadius(12.0);

    double area = circle.calculateArea();
    std::cout << "Area: " << area << std::endl;

    double circumference = circle.calculateCircumference();
    std::cout << "Circumference: " << circumference << std::endl;

    return 0;
}
